JP5851620B2 - Electrode removal device for spot welding - Google Patents

Description

  The present invention relates to an electrode removal device for spot welding used in, for example, an automobile production line.

  2. Description of the Related Art Conventionally, in an automobile production line, spot welding has been used in which an electrode attached to the tip of a shank of a welding gun is pressed against a steel plate to pressurize and energize to weld the steel plate by resistance heating.

  By the way, since the quality of a welding part will fall if the state deteriorates, it is necessary to remove from a shank regularly and to replace | exchange for an electrode with a good state. In an automobile production line, generally, an electrode is removed from a shank by a spot welding electrode removing device. For example, in the spot welding electrode removing device disclosed in Patent Document 1, A rotating body is rotatably provided around the rotation center, and an electrode is set with its center coinciding with the rotation center of the rotating body. The rotating body is provided with a contact portion with which a part of the outer peripheral surface of the electrode contacts. Further, a linear operation lever is fixed to the rotating body in a posture extending in the radial direction of the rotating body so as to face the contact portion with the electrode setting position interposed therebetween. Then, when the electrode is disposed between the contact portion and the operation lever and the operation lever is operated to rotate the rotating body to one side, the end portion of the operation lever on the contact portion side is the electrode. The electrode is sandwiched between the contact portion by pressing the outer surface of the non-contact portion side, and the operation lever is operated to rotate the electrode together with the rotating body to remove it from the tip of the shank. ing.

JP 2009-262201 (paragraphs 0038 to 0051, FIGS. 4 and 7)

  However, in the electrode welding device for spot welding as disclosed in Patent Document 1, when the electrode is rotated with respect to the shank, the operation lever is moved by the frictional resistance between the end portion on the contact portion side of the operation lever and the electrode. A large bending moment is applied. Accordingly, the operation of removing the electrode may be failed due to deformation or breakage of the operation lever due to repeated electrode removal work.

  In order to avoid this, it is conceivable to increase the moment of inertia by increasing the cross-sectional area of the operating lever, thereby increasing the rigidity. However, if the cross-sectional area of the operating lever is simply increased, It will increase in size.

  This invention is made | formed in view of such a point, The place made into the objective is providing the electrode removal apparatus for spot welding which is compact and hard to break.

  In order to achieve the above object, the present invention is characterized in that the shape of the operation lever has been devised.

  Specifically, the following solution was taken for a spot welding electrode removal device that removes an electrode attached to the tip of a shank of a spot welding gun from the tip of the shank.

  That is, in the first aspect of the invention, the rotating body is provided so as to be rotatable around the rotation center, and the electrode is set with its center aligned with the rotation center, and the outer peripheral surface of the electrode is provided on the rotating body. And a pressing portion for pressing the electrode at a position facing the abutting portion closer to the tip, and the tip side of the rotating body is closer to the abutting portion than the pressing portion. A J-shaped operation lever pivotally supported on the side of the part, the electrode is set between the contact part and the pressing part, and the operation lever is rotated to the electrode side. The electrode is sandwiched between the pressing portion and the contact portion by pressing the outer peripheral surface of the electrode with the pressing portion by a moving operation, and the operation lever is further rotated to the electrode side to Rotate the electrode with the rotating body and remove it from the tip of the shank. And butterflies.

  According to a second invention, in the first invention, the operation lever includes a main body portion and the pressing portion, and the pressing portion is detachable from the main body portion.

  According to a third invention, in the first or the second invention, when the operation lever is turned to the counter electrode side and the pressing portion is separated from the electrode at the tip of the operation lever, A pressing protrusion for pressing the side surface of the electrode is formed to release the biting to the contact portion.

  According to a fourth invention, in any one of the first to third inventions, the rotating body accommodates the contact portion and the distal end side of the operation lever inside, and the contact portion and the pressing portion A rotating case having a corresponding electrode insertion hole between the first and second portions, wherein the rotating case is formed with a plurality of drainage holes for draining water that has entered the rotating case.

In a fifth aspect, in the fourth one of the present invention from a first, at least hand of the distal surface and the abutment surface of the operating lever, tri nickel plating layer, or a cation electrodeposition coating layer and wherein the Rukoto that Yusuke.

  In the first invention, since the distal end side of the operating lever is curved along the outer peripheral surface of the electrode, the sectional moment on the distal end side of the operating lever is increased, and the operating lever is not affected even if the electrode is removed repeatedly. Can prevent deformation and damage. In addition, in order to increase the secondary moment on the distal end side of the operation lever, it is not necessary to increase the structure on the distal end side of the operation lever in the radial direction or the rotation center direction of the rotating body, so that the entire apparatus can be made compact.

  In the second invention, even if the state of the pressing portion is deteriorated by repeating the electrode removing operation, only the pressing portion, which is one component of the operating lever, needs to be partially replaced. It is not necessary to replace the whole, the cost of parts is reduced, and the maintenance of the apparatus is easy.

  In the third invention, after the electrode is removed, even if the electrode bites into the contact portion, the pressing protrusion pushes the electrode from the side and peels it from the contact portion. It is possible to prevent the state from being engulfed.

  In the fourth aspect of the invention, the contact portion and the front end side of the operation lever are less likely to be contaminated by dust or the like in the factory, so that failure of the device due to contamination can be prevented. In addition, even when cooling water leaks from the spot welding gun into the rotating case when the electrode is replaced, the cooling water is drained out of the rotating case through the drainage holes. Corrosion can be prevented.

  In the fifth invention, since the operation lever is less likely to rust, the failure of the device caused by corrosion can be reliably prevented.

It is a front view of the removal apparatus for spot welding which concerns on embodiment of this invention. The inside of the apparatus in A arrow view of FIG. 1 is shown. It is sectional drawing in the BB line of FIG. FIG. 3 is a view corresponding to FIG. 2 with the upper case removed, showing a state immediately before the electrode is removed from the tip of the shank. The state immediately after rotating the operation lever from the state of FIG. 4 is shown. FIG. 6 shows a state immediately after the operation lever is further rotated from the state of FIG. 5 to remove the electrode from the tip of the shank.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows an electrode removal apparatus 1 for spot welding according to an embodiment of the present invention. This electrode detachment apparatus 1 is a welding gun G used when welding steel plates by spot welding, in order to remove the electrodes 10 respectively attached to the tips of a pair of upper and lower shanks G1 of the welding gun G from the shanks G1. belongs to.

  The electrode removal device 1 includes a flat rectangular parallelepiped casing 2 and a device main body 3 accommodated in the casing 2, and the electrodes 10 are inserted into the casing 2 in the casing 2. A pair of through-holes 2a are formed vertically.

  As shown in FIGS. 2 to 4, the apparatus body 3 has a U-shaped support frame 5 in plan view having a substantially disc-shaped iron rotating case (rotating body) 4 and an opening 5 a that opens to the side. And.

  The inner side surface of the support frame 5 corresponds to the outer peripheral surface of the rotary case 4, and the rotary case 4 is accommodated inside the support frame 5 so as to be rotatable around a central axis (rotation center). .

  The rotating case 4 is divided into an upper case 41 positioned on the upper side and a lower case 42 positioned on the lower side at a substantially central position in the vertical direction.

  The upper case 41 has a first recess 41a that opens downward, and an electrode insertion hole 41b for inserting the electrode 10 is formed in the center of the upper base of the first recess 41a.

  A first notch 41 c is formed in the outer peripheral portion of the upper case 41 corresponding to the opening 5 a of the support frame 5.

  On the other hand, the lower case 42 has a second recess 42a that opens upward, and an electrode insertion hole 42b for inserting the electrode 10 is provided at the center of the bottom of the second recess 42a. It is formed to face 41b.

  Further, a second cutout portion 42c is formed in the outer peripheral portion of the lower case 42 corresponding to the first cutout portion 41c, and the water that has entered the rotary case 4 is drained around the electrode insertion hole 42b. A plurality of drain holes 42d are formed.

  The rotating case 4 is assembled by aligning the opening periphery of the upper case 41 and the opening periphery of the lower case 42 with each other, and the housing 40 is formed by the first recess 41a and the second recess 42a. In addition, a case opening 44 is formed by the first notch 41c and the second notch 42c.

  An extension plate 43 extending outward in the radial direction of the rotating case 4 is provided near the opening 5 a in the outer peripheral portion of the upper case 41.

  One end of the coil spring 6 is connected to the extension end of the extension plate 43, and the other end of the coil spring 6 is connected to the device fixing side 12, so that the coil spring 6 is connected to the extension plate 43 and the device fixing side. The coil spring 6 is urged to rotate counterclockwise when the rotary case 4 is viewed from above.

On the opening 5a side of the rotating case 4, a fan-shaped contact portion is provided in plan view. In this embodiment, the contact portion is made of iron independent of the rotating case 4 and is fixed to the rotating case 4 so as to be detachable . Hereinafter, the contact portion is referred to as a contact member 7. The surface of the contact member 7 is subjected to trinickel plating treatment. That is, the surface of the contact member 7 has a trinickel plating layer.

  As shown in FIG. 3, the abutting member 7 has a substantially T-shaped cross section in which the inner part is thicker than the outer part, and the inner part is inserted into the electrode insertion holes 41b and 42b. Thus, the upper and lower cases 41 and 42 are substantially flush with the upper and lower surfaces.

  Note that a plurality of sharp protrusions (not shown) are formed around the rotation center of the rotating case 4 on the inner surface of the contact member 7 to make it difficult to slip.

The apparatus main body 3 is provided with an iron operation lever 8 whose surface is subjected to trinickel plating treatment . That is, the surface of the operation lever 8 has a trinickel plating layer.

The operation lever 8 includes a J-shaped main body 8a in plan view.

  The main body portion 8 a includes a straight portion 81 and a curved portion 82 that is continuous with one end of the straight portion 81, and the distal end side of the operation lever 8 is housed in the housing portion 40. The end side extends from the case opening 44 to the outside of the rotating case 4.

  A pressing portion for pressing the electrode 10 is provided on the inner peripheral side of the bending portion 82, that is, at a position facing the contact member 7 near the tip of the operation lever 8. In this embodiment, the pressing portion is made of iron independent of the main body portion 8a and is detachably fixed to the main body portion 8a. The contact member 7 is inserted into the electrode insertion holes 41b and 42b. Opposite to. Hereinafter, the pressing portion is referred to as a pressing member 9.

  The pressing member 9 has a U-shaped cross section and is attached to the operation lever 8 so that the upper part and the lower part are inserted into the electrode insertion holes 41b and 42b and the upper and lower cases 41, 42 is substantially flush with the upper and lower surfaces of 42.

  Note that a plurality of sharp protrusions (not shown) are formed around the rotation center of the rotating case 4 on the surface of the pressing member 9 facing the contact member 7 to make it difficult to slip.

  A tip end side of the operation lever 8 with respect to the pressing member 9 is pivotally supported by a pivot shaft 13 extending vertically to the side of the contact member 7 of the rotating case 4.

  At the tip of the operation lever 8 (the end of the bending portion 82), when the operation lever 8 is rotated to the counter electrode 10 side and the pressing member 9 is separated from the electrode 10, the electrode 10 A pressing protrusion 82a that presses the side surface of the electrode 10 to release the biting on the contact member 7 is formed.

  Further, the apparatus main body 3 is provided with a fluid pressure cylinder 11 extending in the horizontal direction intersecting with the linear portion 81 of the operation lever 8.

  The fluid pressure cylinder 11 has a cylindrical cylinder body 11a and a piston rod 11b extending outward from one longitudinal end of the cylinder body 11a.

  The distal end of the piston rod 11b is connected to the base end of the linear portion 81. When the piston rod 11b advances by the extension operation of the fluid pressure cylinder 11, the operation lever 8 resists the biasing force of the coil spring 6. On the other hand, when the piston rod 11b is retracted by the contraction operation of the fluid pressure cylinder 11 while rotating to the electrode 10 side, the operation lever 8 is rotated to the counter electrode 10 side by the biasing force of the coil spring 6.

  When the electrode 10 is removed, the electrode 10 is inserted from the electrode insertion holes 41b and 42b so as not to contact the pressing protrusion 82a, and the center of the rotating case 4 is rotated. The outer peripheral surface of the electrode 10 is set between the contact member 7 and the pressing member 9 so as to coincide with the center, and the inner surface of the contact member 7 is set in the accommodating portion 40. It comes to contact a part of.

  As shown in FIGS. 4 to 6, the pressing member 9 presses the outer peripheral surface of the electrode 10 on the side opposite to the abutting member 7 by rotating the operating lever 8 toward the electrode 10 side. 9 and the contact member 7, and the electrode 10 is rotated together with the rotating case 4 against the urging force of the coil spring 6 by further rotating the operating lever 8 toward the electrode 10. It is made to remove from the front-end | tip of the said shank G1. At this time, even if the electrode 10 bites on the contact member 7, the pressing protrusion 82 a presses the side surface of the electrode 10 to forcibly release the biting of the electrode 10 on the contact member 7. It has become.

  Next, the removal operation | work from the shank G1 of the electrode 10 is demonstrated.

  First, the electrode 10 mounted on the upper shank G1 is inserted into the electrode insertion hole 41b of the rotating case 4 through the through hole 2a of the casing 2 so as not to contact the pressing protrusion 82a, as shown in FIG. In addition, the center of the electrode 10 is matched with the center of rotation of the rotating case 4.

  Next, the fluid pressure cylinder 11 is extended to advance the piston rod 11b, and the operation lever 8 is rotated to the electrode 10 side. As a result, as shown in FIG. 5, the pressing member 9 presses the outer peripheral surface of the electrode 10 on the side opposite to the contact member 7, thereby sandwiching the electrode 10 with the contact member 7. At this time, the rotating case 4 does not rotate clockwise in FIG. 5 due to the biasing force of the coil spring 6.

  Further, the fluid pressure cylinder 11 is extended to move the piston rod 11b further, and the operation lever 8 is rotated to the electrode 10 side. As a result, as shown in FIG. 6, the electrode 10 rotates with the rotating case 4 against the biasing force of the coil spring 6 and is detached from the shank G1.

  Thereafter, the fluid pressure cylinder 11 is contracted to retract the piston rod 11b, and the operation lever 8 is rotated to the counter electrode 10 side to separate the pressing member 9 from the electrode 10. At this time, since the pressing protrusion 82a of the operation lever 8 presses the side surface of the electrode 10, even if the electrode 10 bites against the contact member 7, the biting of the electrode 10 onto the contact member 7 is forced. Is released.

  The electrode 10 attached to the lower shank G1 is also removed from the shank G1 in the same manner as the electrode 10 attached to the upper shank G1.

  As described above, according to the embodiment of the present invention, since the distal end side of the operation lever 8 is curved along the outer peripheral surface of the electrode 10, the sectional moment on the distal end side of the operation lever 8 is increased. Even if the outside work is repeated, deformation and breakage of the operation lever 8 can be prevented. Further, in order to increase the secondary moment on the distal end side of the operation lever 8, it is not necessary to increase the structure on the distal end side of the operation lever 8 in the radial direction or the rotation center direction of the rotating case 4. The whole can be made compact.

  Further, even when the state of the pressing member 9 is deteriorated by repeating the removal work of the electrode 10, only the pressing member 9 that is one component of the operating lever 8 needs to be partially replaced. It is not necessary to replace the whole 8, the cost of parts is reduced, and maintenance of the electrode removing device 1 is easy.

  Further, after the electrode 10 is removed, even if the electrode 10 bites against the contact member 7, the pressing protrusion 82a pushes the electrode 10 from the side and peels it from the contact member 7. It is possible to prevent the contact member 7 from being stuck.

  In addition, the contact member 7 and the distal end side of the operation lever 8 are not easily contaminated by dust or the like in the factory, so that it is possible to prevent failure of the electrode removing device 1 due to contamination. Further, when the electrode 10 is replaced, even if the cooling water leaks from the spot welding gun G into the rotating case 4, the cooling water is drained out of the rotating case 4 from each drain hole 42d. Corrosion of the member 7 and the operation lever 8 can be prevented.

  Since the entire surface of the operation lever 8 is trinickel-plated, the operation lever 8 is less likely to rust, and the failure of the electrode removal device 1 caused by corrosion of the operation lever 8 is surely prevented. be able to.

  In the embodiment of the present invention, trinickel plating treatment is applied to the entire surface of the contact member 7 and the operation lever 8, but cationic electrodeposition coating is applied to the entire surface of the contact member 7 and the operation lever 8. Also good.

  Further, in the embodiment of the present invention, the trinickel plating process is performed on the entire surface of the operation lever 8, but the trinickel plating process is performed only on the front end side of the operation lever 8 which is easily in contact with water due to the structure of the apparatus. You may give it.

  In the embodiment of the present invention, the contact member 7 and the operation lever 8 are subjected to trinickel plating, but at least one of the contact member 7 and the operation lever 8 is subjected to trinickel plating or cationic electrodeposition coating. It only has to be applied.

  In the embodiment of the present invention, the pressing member 9 is detachable from the operation lever 8, but the pressing member 9 may be integrated with the operation lever 8.

  In the embodiment of the present invention, the contact member 7 is detachable from the rotating case 4, but the contact member 7 may be integrated with the rotating case 7.

  In the embodiment of the present invention, the plurality of drain holes 42 d are formed only in the lower case 42, but a plurality of drain holes may be formed in the upper case 41.

  In the embodiment of the present invention, the electrode removal device 1 is used in such a posture that the rotation center of the rotation case 4 faces in the vertical direction. However, the rotation center of the rotation case 4 is in the horizontal direction. It can also be used in a facing position.

  The present invention is suitable, for example, for an electrode removal device for spot welding used in an automobile production line.

1 Electrode removal device for spot welding 4 Rotating case (rotating body)
7 Contact member (contact part)
8 Operation lever 8a Body part 9 Pressing member (pressing part)
10 Electrode 41b, 42b Electrode insertion hole 42d Drainage hole 82a Pressing protrusion G Spot welding gun G1 Shank

Claims (5)

An electrode removal device for spot welding that removes an electrode attached to a tip of a shank of a spot welding gun from the tip of the shank,
A rotating body that is rotatably provided around a rotation center, and the electrode is set so that the center of the electrode matches the rotation center;
A contact portion that is provided on the rotating body and contacts a part of the outer peripheral surface of the electrode;
There is a pressing part for pressing the electrode at a position facing the contact part near the tip, and the tip side of the pressing part is pivotally supported on the side of the contact part of the rotating body. J-shaped control lever,
The electrode is set between the abutting portion and the pressing portion, and the pressing portion presses the outer peripheral surface on the side opposite to the abutting portion with the pressing portion by rotating the operation lever toward the electrode side. The electrode is sandwiched between the contact portion and the contact portion, and the electrode is rotated together with the rotating body and removed from the tip of the shank by further rotating the operation lever toward the electrode. Electrode removal device. The spot welding electrode removing device according to claim 1,
The operation lever includes a main body portion and the pressing portion,
The electrode removing device for spot welding, wherein the pressing portion is detachable from the main body portion. In the electrode welding apparatus for spot welding according to claim 1 or 2,
At the tip of the operation lever, when the operation lever is rotated to the opposite electrode side and the pressing portion is separated from the electrode, the electrode is released to release the biting of the electrode to the contact portion. An electrode removing apparatus for spot welding, wherein a pressing projection for pressing the side surface of the electrode is formed. In the electrode removal apparatus for spot welding as described in any one of Claim 1 to 3,
The rotating body is a rotating case that accommodates the contact portion and the distal end side of the operation lever inside and has a corresponding electrode insertion hole between the contact portion and the pressing portion,
An electrode removing apparatus for spot welding, wherein the rotary case is formed with a plurality of drain holes for draining water that has entered the rotary case. In the electrode removal apparatus for spot welding as described in any one of Claim 1 to 4,
At least a hand of the distal surface and the abutment surface of the operating lever, tri nickel plating layer, or spot welding electrode detaching device according to claim Rukoto that having a cation-electrodeposition coating layer.

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